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Re: High Power EP for 8" f6 Dob


Richard Harding
 

Hi Jim!
Good understanding of the issues. Eye relief for someone who wears glasses is a prime consideration. Especially when glasses kill a "wide field" (nothing like looking in a 7 mm. Nagler and seeing only 50 of the 82 deg.!! One thing to consider is that wearing glasses becomes less of an issue at smaller exit pupils (ie. higher magnifications) and one can often get away without glasses. However, taking off putting on is not my cup of tea, and I choose to view with my glasses on. This being said, the options that you have outlined are good, but I will make the following observations(my 2 cents worth :o)

My favourite eyepieces in my collection are:

1. 35 Panoptic - out of this world performance if you don't look into a 31 Nagler...it will spoil you.
2. 10.5 mm and 21 mm Pentax XLs. Drop dead georgeous eyepieces. The contrast and colour rendering are unparalled IMHO. The 65 deg. field falls short of the 82 deg. field of a Nagler, so you may want to look at the Type 4 Naglers. But these are the most "comfortable" eyepieces that I have ever used. I feel that the larger field makes them a notch above the Radians' 60 deg., and I never could get to like the "click stop" eyeguard.
3. 13 mm. Nagler. Wow field, with a fairly good eye relief. Good with my glasses, but without to see the whole field, the kidney bean effect drives me crazy!! I have been offered a trade for this eyepiece for a 14 mm. Pentax and I am considering it.
4. 17 mm. Vixen LVW. I like this eyepiece and its 65 deg. field. It is far superior to my 7.5 LV which I don't use much. Its only problem is its price where it runs into competition with the Pentaxs, Taks, and Radians ie. not good value when you consider re-sale value.

I sold my 10 mm. and 14 mm. Speers-Walers to purchase the Pentax and Nagler. I don't regret it. The Speers are fine eyepieces, but the eye relief is tight.

My suggestion? Buy a 10.5 mm. Pentax or Radian and get a quality barlow. this will be a good combo for higher magnification, and will definately optimize your scope (BTW, as well a C-8 Deluxe, I have an 8" Dob, and my 35 Pan, and 13 Nagler will NOT come to focus. Be carefull with this before buying wide angle eyepieces. Try to find one to test first!). If money is no object, look at the 12 mm. Nagler Type 4, with quality barlow.

Clear skies!!
Richard Harding




Hi Experts,<BR>

I've got on Orion XT8 f/6 dob and am not too happy with the stock<BR>
10mm plossl eypiece and am thinking of making an acquisition.<BR>
<BR>
My constraints are: 1) I'm an eyeglass wearer and I like to (try to) <BR>
sketch some of my targets so I prefer to keep my glasses on when <BR>
observing; 2) I am using a dob, and although I do have plans to build <BR>
an equatorial platform, I still think that a wide field of view would <BR>
be better; 3) I'm under the impression that about 125x is optimal for <BR>
alot of deep sky observations; 4) I've got a 32mm plossl, 26mm plossl <BR>
and 2x barlow which I'm quite happy with, so I'm looking for<BR>
something to compliment this set; 5) I've looked through a 9mm<BR>
Nagler, and although the view is jaw-dropping I find the eye-relief <BR>
tight for my needs)<BR>
<BR>
The 3 eyepieces I'm considering are:<BR>
1) an 8mm LVW Lanthanum Superwide (65 degree FOV, 20mm eye relief, <BR>
150x, ~$350 CDN)<BR>
2) a 10mm Speers Waller(70 degree FOV, 16 mm eye relief, 125x, $200 <BR>
CDN) - looked through one at Focus, unsure if eye relief is<BR>
sufficient when wearing glasses<BR>
3) a 10.5 Radian (60 degree FOV, 20mm eye relief, 114x, ~$350 CDN - <BR>
will have to order, not available locally)<BR>
<BR>
If anybody has had experiences with any of the above eyepieces or can <BR>
think of any other alternatives which might meet me needs I'd really <BR>
appreciate hearing of your experiences.<BR>
<BR>
Thanks in advance!<BR>
Jim<BR>
<BR>
<BR>
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